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My 2005 gmc sierra 5.3 l having problems with these codes changed post cat sensors was running good for couple days then codes came back ran outta ideas

December 21, 2012, 10:41 am

Elizabeth K

p0650 means there is a problem with the MIL (malfunction indicator lamp) circuit. Does the Check Engine Light come on when you turn the key to ON (not START)? If not check the bulb behind the dash for it. Sometimes people remove the bulb because they are unable to fix a problem causing the MIL to come on.

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